Miles between Thornton, CO and Sammamish, WA

There are
1,286 mi
from Thornton, CO to Sammamish, WA

That's the driving distance. It would take 22 hours 21 mins to go from Thornton, Colorado to Sammamish, Washington.

The flight distance (direct flight from Thornton, CO to Sammamish, WA) is 1,005.32 mi.

1,286 mi = 1.61 kms